Method and system for providing annotations of a digital work

ABSTRACT

Methods and systems for receiving and distributing annotations of a digital work include receiving an annotation of the digital work, storing the annotation, and providing the annotation to a user. The user may be required to submit a valid authorization credential for the annotation. Annotations may be textual or graphical, and may be associated with particular content in a digital work. Indicators may be displayed to identify content in the digital work for which annotations are available. A user may exchange compensation or perform a specified action for access to an annotation. Some or all of the compensation received for an annotation may be distributed to the author of the annotation. Multiple annotations may be listed in an order based a criterion, such as ranking, price, or date of receipt. Users that purchase a digital work may automatically receive an authorization credential to receive annotations of the digital work.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No. 11/039,645, filed Jan. 19, 2005, the entire disclosure of which is hereby incorporated by reference herein.

FIELD OF THE INVENTION

The present invention relates to distribution of digital works, and more particularly to creating a market for distribution of annotations of digital works.

BACKGROUND OF THE INVENTION

For many years, print media provided the only way to transmit information and ideas in a fixed form. With the advent of photography and audio recording, additional media have become available for transmitting information and ideas. The information in such media, however, is static. Updated information is provided only by preparing and distributing additional media. However, widespread distribution of updated information, including comments, supplements, features, thoughts, insights, etc., becomes difficult when the information is authored by multiple parties. Media consumers having additional information or insight typically do not have a way to effectively share that information with other consumers. What is needed is a method and system that allows users of media to easily annotate the media and afterward distribute such annotations to others in an economical and efficient manner. The present invention addresses this need and other shortcomings in the prior art.

BRIEF SUMMARY

In one aspect, a method and system for receiving and distributing annotations of a digital work includes identifying a digital work and receiving an annotation of the digital work. The annotation may be stored in a database in association with the digital work. A user desiring to access the annotation submits an authorization credential that, if valid, enables the user to receive the annotation of the digital work. The annotation may be presented to the user in context with regard to the digital work.

In some embodiments, a digital work may be annotated with textual or graphical annotations. Examples of graphical annotations include handwritten text and pictures, as well as typed text, clips from other works, images, etc. Annotations may also include, for example, highlighting of text in a digital work. If desired, an annotation may be associated with particular content in a digital work.

An annotation delivered to a user may be viewable concurrent with a display of the digital work with which the annotation is associated. In some embodiments, annotations may be normally hidden and become viewable when a user positions a cursor or pointer near particular content in the digital work to which the annotations pertain. Indicators may be displayed with the digital work to identify content in the digital work for which annotations are available. If the digital work is an audio or audiovisual work, indicators identifying annotations may be displayed with a playback control provided for playback of the digital work. In yet other embodiments, the availability of annotations for a digital work may be identified by indicators in a listing of contents for the digital work.

In another aspect, a user may obtain an authorization credential for an annotation in exchange for compensation. The user may then submit the authorization credential to obtain the desired annotation. In some circumstances, the authorization credential may represent compensation from the user. Where monetary compensation is received for an annotation, some or all of the compensation may be distributed to the author of the annotation. An indication of satisfaction from the user to whom the annotation is provided may be required before the compensation is distributed to the author. A user may submit an authorization credential that is specific to an annotation and have it considered as a request for the particular annotation.

When multiple annotations are associated with particular content in a digital work, a user desiring annotations may be provided with a list that presents the multiple annotations in an order determined by reference to a criterion. In some embodiments, the criterion may be a ranking of the annotations assigned by others who have previously viewed the annotations. In other embodiments, the criterion may be a price assigned to each of the annotations. In yet other embodiments, the criterion may be a date of receipt of each of the annotations.

In another aspect, users that purchase a digital work may automatically be given an authorization credential that enables them to receive annotations of the digital work. Such annotations, when combined with the digital work to which they pertain, may be configured to become accessible to the user upon accessing the digital work.

In another aspect, a user may be given an authorization credential in exchange for performance of a specified action. For example, an authorization credential may be given to a user as a reward for electronically previewing a digital work or contributing an annotation of a digital work.

Embodiments of the invention may also enable multiple parties to be authorized distributors of credentials for access to annotations. Members of a family, a group of students in a class, or participants in a book club, for example, may annotate a digital work and share their annotations with the others in their family or group by distributing appropriate authorization credentials among the family or group.

Computer systems may be configured to provide features and aspects of the present invention. For example, a server system may be configured to interact with a client system to receive and provide annotations of a digital work. The server system may comprise, for example, an interface for communicating with one or more client systems, a memory, and a processor for executing program instructions stored in the memory. The server system may receive from a client system an annotation of the digital work. If desired, the annotation may be associated with particular content in the digital work. The server system may store the annotation in the memory and upon receipt of a valid authorization credential from a client system, the server system may provide the annotation to the client system, possibly with an indication of the particular content in the digital work to which the annotation pertains.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same become better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a pictorial diagram of a computing environment that includes a server system and a number of client systems communicatively connected via a network;

FIG. 2 is a schematic block diagram of an exemplary embodiment of a server system that may be used in the computing environment of FIG. 1;

FIG. 3 is a flow diagram of a method of the present invention for receipt and distribution of annotations;

FIG. 4 is a flow diagram illustrating a payment and feedback aspect of the present invention;

FIG. 5 is a pictorial diagram of an exemplary Web page formed in accordance with an embodiment of the present invention presenting a digital work and annotations in textual format;

FIG. 6 is a pictorial diagram of an exemplary Web page formed in accordance with another embodiment of the present invention presenting textual annotations in a separate window;

FIG. 7 is a pictorial diagram of an exemplary Web page formed in accordance with yet another embodiment of the present invention presenting graphical handwritten annotations superposed on a textual digital work;

FIG. 8 is a pictorial diagram of an exemplary Web page formed in accordance with still another embodiment of the present invention presenting a digital work and/or annotations in an audio or audiovisual format; and

FIG. 9 is a pictorial diagram of an exemplary Web page formed in accordance with another embodiment of the present invention presenting a digital work and annotations in a textual format, with the annotations presented to a user in a list.

DETAILED DESCRIPTION

FIG. 1 provides an exemplary overview of one computing environment in which embodiments of the invention may be implemented. The depicted environment includes a server system 10 and one or more client systems 12, 14 communicatively connected by a network 16. The client system 12 is shown associated with a user 18, and the client system 14 is shown associated with a user 20.

Also depicted in FIG. 1 are client systems 28, 30 communicatively connected to the server system 10 via the network 16. The client system 28 is shown associated with an author 32, and the client system 30 is shown associated with an author 34.

The terms “user”, “author” and “source” are generally used herein. A “user” typically refers to a person, entity or device that seeks to receive an annotation previously stored in association with a digital work. An “author” typically refers to a person, entity or device that prepares an annotation for storage and distribution to users. A “source” typically refers to a person, entity, or device that originates a digital work that may be annotated by an “author”. As should be readily appreciated, a person, entity or device can be a source, an author and/or a user, depending on the distribution of a digital work and whether an annotation is being prepared or requested. Accordingly, at different times, the users 18, 20 can be “authors” and the authors 32, 34 can be “users”, and any of them (or some other third party) may be the source of a digital work.

As will be described with regard to the particular embodiments shown herein, the server system 10 is configured to exchange data and information, including digital works and annotations thereof, with the users 18, 20 who are operating the client systems 12, 14 and the authors 32, 34 who are operating the client systems 28, 30. In some circumstances, the server system 10 may be associated with a merchant, such as an online retailer authorized to provide a marketplace for selling and distributing digital works to consumers. Digital works, in the context of this description, may include any type of content that can be stored and distributed in digital form. By way of illustration, without limitation, digital works can include all forms of textual information such as books, magazines, newspapers, newsletters, manuals, guides, references, photographs, articles, reports, documents, etc., and all forms of audio and audiovisual works such as music, multimedia presentations, audio books, movies, etc.

Digital works may be stored as media files in a digital works database 22 that resides in or is otherwise communicatively connected to the server system 10. An annotations database 24 and a transaction information database 26 are also shown in FIG. 1 residing in or otherwise communicatively connected to the server system 10 and will be described in greater detail below. The server system 10, separately or together with the databases 22, 24, 26, may provide an online marketplace 36 that can receive and distribute annotations as well as the digital works to which the annotations pertain.

The network 16 shown in FIG. 1 may be a local area network (LAN) or a larger network, such as a wide area network (WAN), collection of networks, or the Internet. Protocols for network communication, such as TCP/IP, are well known to those skilled in the art of computer networks. An author, such as author 32, may operate a client system, such as client system 28, to request a digital work from the server system 10 via the network 16. The author 32 may also communicate annotations of a digital work to the server system 10 for storage in the annotations database 24 and distribution to others, such as the user 20. The user 20 may operate the client system 14 to request digital works and/or annotations thereof from the server system 10. As will be appreciated by those skilled in the art and others, FIG. 1 provides a simplified example of one suitable computing environment for implementing embodiments of the present invention, and the invention is not limited thereto.

When software formed in accordance with the invention is implemented in one or more computer systems, for example, of the type illustrated in FIG. 1, the computer systems provide a way for authors and users to access digital works, provide annotations thereto, and receive annotations of digital works. Providing a mechanism for annotation of a digital work and providing a mechanism for distribution of the annotation makes the underlying digital work more useful and valuable by providing improved or clarifying material in the digital work, updating material, correcting material, adding academic interest or “color” to the material, providing editorial comments to the material, etc. Embodiments of the invention may be implemented such that authors of annotations may receive some or all of compensation paid by other users to access the annotations.

FIG. 2 depicts an exemplary computer architecture for a server system, such as the server system 10, that may be used to implement embodiments of the invention discussed herein. Of course, persons skilled in computers will appreciate that other server systems suitable for use may include more or fewer components than those shown in FIG. 2.

The server system 10 shown in FIG. 2 is connected to the network 16 (FIG. 1) using a network interface 60. The network interface 60 includes hardware and software that allows the server system 10 to communicate with other computing devices connected to the network 16 by use of one or more suitable communication protocols, such as TCP/IP.

The server system 10 shown in FIG. 2 further includes a processor 50, a memory 52, a video display adapter 54, a disk drive 56, and an input/output interface 58, all of which are communicatively connected together and to the network interface 60 by a communication bus 62. The memory 52 generally comprises RAM, ROM, and/or other volatile or permanent memory. The memory 52 is shown storing an operating system 64 for controlling the operation of the server system 10. A binary input/output system (BIOS) 66 for controlling the low-level operation of the server system 10 is also stored in the memory 52.

The memory 52 additionally stores program code and data for providing network services that allow client systems to exchange information and data files with the server system 10. Accordingly, the memory 52 may store a Web server application 68, which may be provided by any one of a number of commercially available software packages. The Web server application 68 comprises computer executable instructions, that, when executed by the processor 50, generate or otherwise obtain configurable markup documents such as the sample Web pages shown in FIGS. 5-9, for display on client systems. The Web server application 68 communicates with a database manager application 70 and a transaction manager application 72 that facilitate additional functions of the server system 10 described below.

The video display adapter 54 provides display signals to a local display (not shown in FIG. 2) permitting an operator of the server system 10 to monitor and configure the operation of the server system. The input/output interface 58 likewise communicates with external devices not shown in FIG. 2, such as a mouse, keyboard, scanner, or other input and output devices that can be operated by an operator of the server system 10.

Further included in the server system 10 is a mass storage 74 comprising facilities such as one or more CD-RW/DVD-RW drives, hard disk drives, tape drives, etc., or combinations thereof, that are utilized to store digital content and information, such as annotations. In the embodiment shown in FIGS. 1 and 2, the mass storage 74 contains the digital works database 22, annotations database 24, and transaction information database 26.

Turning back to FIG. 1, the client systems 12, 14 and 28, 30 may take the form of any one of a number of different computer products and may include aspects of the computer architecture illustrated in FIG. 2, where appropriate. For example, the client systems 12, 14 and 28, 30 can include a network interface that enables communication with other computing devices such as the server system 10 via the network 16. Wired or wireless network connections may be used with any suitable communication protocol, such as TCP/IP. In general, the client systems 12, 14 and 28, 30 typically include a processor, a display, and a memory that stores program code and data for operating the client systems. The memory of the client systems 12, 14 and 28, 30 may also store an application for browsing Web pages, such as the Web pages shown in FIGS. 5-9.

The above-described computer systems may store software instructions that, when executed, implement aspects and features of the present invention. For example, such software can be stored on a computer-accessible medium (e.g., magnetic or optical disk or other device), or downloaded from a remote source, for loading into memory 52 to be executed by the processor 50. For illustrative purposes, described herein are embodiments of the invention that allow authors and users to access digital works, to receive annotations of those digital works from authors and to provide annotations of digital works to users, typically in exchange for some form of compensation or completed action by the user. Although the illustrative examples described herein depict a Web-based implementation, those of ordinary skill in the art will appreciate that other embodiments of the invention may use other implementations for communication and display of information to authors and users.

FIG. 3 is flow diagram of one exemplary method 80 for receiving and providing an annotation of a digital work. In this particular embodiment, the method 80 begins at optional block 81 in which a digital work is obtained from a source, including but not limited to a publisher, a writer, or other originator of the work. At block 82, the digital work is provided in a manner that the digital work is accessible to others. As noted earlier, the server system 10 may include a digital works database 22 with media files containing all forms of digital content, such as books, photographs, manuals, music, movies, etc. A directory of digital works in the digital works database 22 may be provided to the client systems 12, 14 and 28, 30 by the database manager 70 of the server system 10. Files containing the digital works may be requested, displayed, played back, or otherwise consumed by the client systems 12, 14 and 28, 30. Delivery of digital works to the client systems 12, 14 and 28, 30 may be accomplished in a variety of ways including, but not limited to, downloading the digital files, streaming the digital files from the server system 10, or providing access to the digital works at a computer-accessible source (e.g., by providing a URL to the digital work).

U.S. patent application Ser. No. 10/669,088, filed Sep. 23, 2003, which is commonly owned by the assignee of the present invention and incorporated by reference herein, discloses embodiments of systems that may be used in connection with embodiments of the present invention. Such systems may include one or more databases that include digital works in multiple representations. One representation of a digital work may include images of pages of content, while another representation of the digital work may include text searchable forms of the content. The content in the page images correlates with the text searchable form of the content. The page images may be stored in a page image database, while the searchable text may be stored in a text searchable database. Images of pages of content may be acquired using methods known in the art, such as scanning printed pages, converting electronic text to document images, retrieving page images from memory, receiving page images from others, etc.

For each image of a page of content, a recognition routine, such as an optical character recognition (OCR), may be performed on the page image to identify the text, position, and size of each word on the page and provide a text searchable representation of the page. A “word,” in this context, may encompass any grouping of one or more characters, numbers, or symbols. Moreover, a word may stand alone or be associated with a non-text object, such as a picture or graphic. OCR routines are well known in the art of electronic document processing and do not require further discussion herein. The resulting text, position, and size information obtained from processing text on page images is may be stored in the text searchable database.

The text searchable database may be organized as desired, which may include using data structures optimized for full text searching. In one suitable embodiment, each word in the text searchable database has associated therewith content identification numbers for digital works (e.g., SKU numbers) and page numbers corresponding to the digital work and the images in the page image database where the particular word is found. Furthermore, the text searchable database typically includes information that identifies the position and size of the text (and possibly non-text objects associated with the text) as found on each respective page image. In one implementation, the position and size information is recorded as “quads,” which include four numbers representing the X and Y position and the width and height of the text as it appears on a particular page image. All of this information may be encoded in the text searchable database to reduce the storage space required.

As will be described in more detail below, in some embodiments an annotation may be received in regard to particular content of a digital work. A text searchable database as discussed above can be used to enable an author of an annotation (or other person, entity or device) to indicate particular content in a digital work and associate an annotation with the particular content. As noted, the text searchable database may be constructed to include information that helps identify the image(s) in the page image database corresponding to the particular content. Thus, when an author of an annotation indicates particular content in a digital work by selecting text in the text searchable database, the selected text not only identifies the particular content that the author is annotating, but also identifies the corresponding page image(s) in the page image database where the particular content is represented. Word position and size information as discussed above may be helpful in this regard in that it correlates text in the text searchable database with the location of text as represented in a corresponding page image.

Supposing, for example, the author 34 (FIG. 1) desires to submit a comment on a digital work, provide updated or supplemental material, or otherwise annotate a digital work, the author 34 enters the annotations into the client system 30. The author 34 may enter the annotations into the client system 30 in a wide variety of formats depending on the software and hardware provided at the client system. In one format, for example, the author 34 may operate a keyboard to enter text annotations into the client system 30. In another format, the author 34 may enter graphical annotations, such as handwritten notes or drawings. The graphical annotations may appear in context with regard to the digital work being annotated, for example, in the margins, adjacent to, or superposed over or near particular content in a display of the digital work. Handwritten annotations may be particularly suited where the client system 30 is a tablet PC or PDA with a sensitive screen that readily accepts handwritten input. In another format, the author 34 may annotate the digital work by providing an image file containing an image pertaining to the digital work. When the server system 10 receives an annotation of a digital work from an author, such as author 34, the author may indicate one or more particular locations or content in the digital work to which the annotation pertains. In some implementations, the author 34 may be required to sign in or otherwise submit an identification before the author is allowed to submit annotations to the server system 10.

As indicated at block 84 in FIG. 3, the server system 10 may receive annotations of a digital work from an author. In a circumstance where author 34 is providing annotations to the client system 30, the client system 30 communicates the annotations to the server system 10 via the network 16. Annotations received by the server system 10 may be stored in the annotations database 24, in association with the digital work, as indicated at block 86. Storing an annotation in association with a digital work may be accomplished in any suitable manner, including simply storing the annotation in the annotations database 24 with an indication of the digital work to which the annotation pertains, and if apt, the particular content within the work to which the annotation pertains. Typically, the operator of the server system 10 has previously secured an agreement with the author concerning any copyright or other proprietary interest the author may claim in annotations submitted to the server system 10.

Embodiments of the present invention have a wide applicability of which the following examples are only a small part. The following examples give selected contexts for appreciating several advantages of the invention. An annotation, for example, may be a critique or alternatively a summary of the digital work. An annotation may be a separate essay on the same topic presented in the digital work. Annotations may be words, graphs, formulae, files, images, enhancements, etc., provided by the user. For example, a user may wish to annotate a travel book by providing recent images of locations described in the travel book. For digital works that are audio, such as music files, authors can annotate the music files with additional content commenting on the songs, providing background information on the singer or the recording process, alternative lyrics, technical information as to the composition, related musical compositions, etc. In a circumstance where the digital work is a cookbook, for example, authors may submit alternative ingredients that enhance a recipe, ingredients that make a spicier dish, ingredient substitutions considered to be lower in fat or carbohydrates, etc. In another circumstance, a student or teacher as an author may provide a markup of an academic textbook. As can be appreciated from the foregoing, there is virtually no limitation to the type, form and content of annotations that can be added to a digital work. By way of illustration, an annotation can also be in the form of a link or address to another page, file, or document available to the server system or the client system(s).

A user, such as the user 18 shown in FIG. 1, obtaining a digital work from the server system 10 may be notified by the server system 10 that annotations to the digital work are available. If desired, the server system 10 may present one or more summaries of the annotations or portions of the annotations to the user 18 for a preview.

As indicated at block 88 in FIG. 3, the server system 10 may receive a user request for an annotation of a digital work. This request typically identifies the digital work and possibly the particular annotation desired. Depending on implementation, distribution of annotations of digital works may be limited to users having an appropriate authorization credential that, when presented to the server system 10 and validated, enables the user to receive the requested annotation. Additional discussion of authorization credentials is provided below. As indicated at decision block 90, the method 80 determines whether the user has presented an authorization credential. If not, the method 80 terminates at block 92 by denying the user access to the requested annotation. If an authorization credential has been presented, the method 80 determines at decision block 94 whether the authorization credential is valid. If the authorization credential is not valid, the method 80 terminates at block 92 by denying the user access to the annotation. Otherwise, the annotation of the digital work is provided to the user at block 96. Delivery of an annotation to the user may be accomplished by downloading the annotation, streaming the annotation from the server system 10, or providing access to the annotation at a network source (e.g., by providing a URL to the annotation), possibly together with and perceptibly associated with some or all of the digital work to which the annotation pertains.

Authorization credentials presented by users may take any form appropriate for processing in the server system 10. For example, an authorization credential may be a token comprised of symbols or an alphanumeric code that is recognized in the server system 10. Users may obtain authorization credentials for accessing annotations in various ways. For example, a user purchasing a digital work may automatically receive an authorization credential to receive present and/or future annotations of the digital work without charge. Alternatively, a user may provide some form of compensation to the server system 10, such as a monetary payment or other item or representation of value. A user may also receive an authorization credential as an incentive for performing an action specified by the server system 10. For example, a user may receive an authorization credential for electronically previewing a digital work or purchasing one or more related digital works or annotations. Users may also receive authorization credentials for performing actions such as filling out surveys, participating in games, or providing annotations to digital works. In some circumstances, free access to annotations may be provided by simply giving the user an authorized credential when the user requests access to the annotation.

The server system 10 is configured to receive an authorization credential from a user requesting an annotation and determine whether the credential is valid, thus enabling the user to access the annotation. A user's authorization credential can be determined valid in any suitable manner, including comparing a user-submitted credential to a list of known credentials that have been authorized and distributed to users. Use of a credential may cause the credential to be removed from the list in this example, in cases where the credential is intended for a single use. Validation of an authorization credential may be separately communicated to the user or simply followed by delivery of the requested annotation to the user.

In other embodiments, an authorization credential may be generated and distributed for use with a specific annotation or group of annotations and as such, may be used only to authorize access to the specific annotation or group of annotations. Moreover, depending on the format of the authorization credential, the authorization credential may itself identify the annotation to which it pertains. In that case (where the authorization credential identifies the annotation), embodiments of the invention may be configured to receive the authorization credential and automatically consider it as a request for the annotation. A user may thus request an annotation and present the authorization credential in a single step.

Authorization credentials can be advantageously used to create a market for distribution of annotations to others. For example, where a user intends to submit monetary compensation for annotations, the user may be given a price list for annotations to a digital work. The user can then select which annotations the user desires to receive and pay for the annotations. In other embodiments, a subscription model may be used where the user pays a monthly or annual fee to have access to certain groups or all available annotations. Commercially-available payment processing systems may be used by an online marketplace 36 (FIG. 1) to receive a payment from the user for annotations.

Another aspect of creating a market for annotations of digital works is to provide incentive for users to submit annotations. FIG. 4 illustrates a flow diagram of a method 100 in which monetary compensation is paid for an annotation and some or all of such compensation is distributed to the author of the annotation. At block 102, the server system 10 receives a payment from a user for an annotation, records the transaction in the transaction information database 26, and provides the user an authorization credential to access the annotation. Compensation received from the user may be paid directly to the author of the annotation, or, as illustrated at block 104 in FIG. 4, some or all of the payment may be stored in a separate account by the transaction information database 26 for distribution to the author. Distribution of compensation to the author may be conditioned on the user's satisfaction with the annotation. At block 106, feedback regarding the annotation is received from the user. If, at decision block 108, the user's feedback indicates that the annotation was satisfactory, some or all of the payment stored at block 104 is distributed to the author of the annotation. If the annotation was not satisfactory to the user, the server system 10 may process a refund of the payment to the user, as indicated at block 110.

It should be noted that “authors” and “users” can be, and typically are, distinct from the persons, entities, or devices that are the creators, originators, producers, publishers, distributors, or other “sources” of digital works to be annotated. To further illustrate distinctions between “authors”, “users”, and “sources”, consider a person A who writes a book that publisher P publishes in hardbound, paperback, audio (e.g., “books on tape”), and/or digital forms (e.g., electronic books that can be viewed using a suitable device incorporating a visual display), these forms of the book being distributed to the public, for example, through retail outlets such as book stores, book clubs, and online marketplaces accessible via computer networks. As to the last, publisher P may authorize the limited reproduction of all or selected portions of the book by such online marketplaces for promotional purposes.

Now consider a person B who wishes to write a review of the book, as for a newspaper, magazine, online journal, or even for one of the online marketplaces that offers the book for sale. In accordance with suitable embodiments of the invention, person B's review can be (or can become) an annotation to A's book, given proper authorization(s) by A, P, and/or B for this to occur, and can be bought, sold, traded, rented, etc., at the same online marketplace as A's book and/or at other online marketplaces or retail establishments. B's review need not be limited to a conventional self-contained review essay that is written to be read separately from A's book. Instead (or additionally), in accordance with embodiments of the invention, B may write some or all of the book review as a set of annotations that pertain to, and are fully understandable when read in context with, specific sections or passages of the book.

For example, B's review may focus on textual passages or pictures or diagrams in A's book that, to B's sensibilities, seem particularly noteworthy, and link or associate these with corresponding portions of the review. In other words, B annotates the passages or images, and the annotations, taken together, make up some or all of B's book review.

With A's original work and B's review now available, it becomes possible for another person C to annotate both A's book and B's review thereof, as digital works. A and/or B may, if they choose, respond to C's comments and to one another, with all these comments and responses being added as yet further annotations to A's book, suitably limited to or associated with pertinent passages and/or prior annotations, as appropriate, that are read in context with the pertinent sections or passages of the book.

The entire set of annotations or subsets thereof (e.g., only C's annotations, or only A's responses, or only annotations made at the behest of publisher P) can be made available with appropriate authorizations from A, B, C, and P, as may be necessary (or, in some instances, under the doctrine of fair use or other legal rubric without prior authorization) for purchase, rental, exchange, or other use by a consumer D. Thus, A and P may be considered “sources” in this example; B, C and A (in the role of responding to B's and C's annotations) may be considered “authors”; and D may be considered a “user”. Further, a particular online marketplace M (or other forum in which annotations and annotated digital works according to the invention are made available to “users”) may be considered none of these, although it will be appreciated that in some situations where publisher P owns marketplace M or vice versa, or where A self-publishes a book through M without the assistance of a conventional publisher P, M may be viewed as a “source”.

As will be described below in reference to FIGS. 5-9, annotations of a digital work may be viewable concurrent with or separate from a display of the digital work. Annotations may be received in graphical form, including handwriting. Annotations may also include highlighting of text in the digital work. In some circumstances where annotations are associated with particular content in the digital work, the annotations may be presented in a manner such that the annotations are normally hidden and become viewable only when a user positions a cursor or pointer near the particular content in the digital work. Techniques for recognizing the position of a cursor or pointer within a digital work displayed on a screen are known in the art.

Furthermore, indicators may be included in the digital work to identify particular content having annotations. In a textual digital work for example, the indicators may appear as footnotes, graphical icons, symbols, characters, or other indicia that are located with the text. Where the digital work is an audio work or an audiovisual work, an annotation associated with particular content in the digital work may be identified by an indicator in a playback control provided for playback of the digital work. In yet another alternative, a digital work having annotations pertaining to particular content in the digital work may provide a listing of contents for the digital work with indicators in the listing of contents identifying the location of the annotations.

Turning now to the example given in FIG. 5, a browser program 120 may be used to depict a Web page to a user. In the embodiment shown in FIG. 5, the Web page includes a display of a digital work 122, here comprising a manual for a cordless telephone. The digital work 122 shown provides instructions for installation of a new battery back in a telephone handset. The digital work, in this example, is textual in form.

Displayed with the digital work 122 are indicators 124, 126 indicating the presence of annotations to the digital work. The indicators 124, 126 may be graphical icons, characters, or symbols that are simply displayed with the digital work. Alternatively, the indicators 124, 126 may provide active links that initiate the display of corresponding annotations when a user activates (e.g., checks or clicks on or hovers over) the indicators 124, 126.

The Web page illustrated in FIG. 5 further includes a section 128 for displaying annotations of the digital work 122. In some embodiments, the annotations 128 may be displayed in a frame that is separate from a frame in which the digital work 122 is displayed. Activating the indicators 124 and 126 in the display of the digital work may cause the annotations section 128 to appear. The particular annotation associated with the indicator 124, 126 that the user has activated may appear highlighted, if desired. Annotations may also be associated with the indicators 124, 126 by use of a suitable numbering system where numbers in the indicators 124, 126 correspond to numbers (not shown) associated with each of the annotations.

FIG. 6 is a pictorial diagram of a Web browser 130 providing another exemplary Web page formed in accordance with an embodiment of the present invention. In this embodiment, textual annotations 138 are presented, but in a separate window that may appear superposed on the display of the digital work 132. This embodiment is particularly suited to environments where the user may activate indicators 134 and 136 to cause the annotations window 138 to appear. Typically, the annotations window 138 provides a way for the user to close the window so the user may continue to read the text of the digital work 132, if any, hidden behind the annotations window 138. Standard windowing technology may also be used to permit the user to resize or move the annotations window 138 within the display of the Web browser 130.

In yet another embodiment of the invention, a Web browser 140 as shown in FIG. 7 may provide a Web page display of a digital work 142 in which annotations 144 and 146 are presented in a graphical, handwritten format. The handwritten annotations 144 and 146 may be displayed just as they are received from the author of the annotations. Of course, such annotations can include graphical drawings as well as handwriting. An annotation may also be provided in the form of a color or bold highlight 148 that is displayed with the text of the digital work 142. As shown in FIG. 7, the annotations 144, 146, 148 may be configured to appear to a user superposed on an image of the digital work.

Digital works and/or annotations may also be received from authors and presented to users in an audio or audiovisual form, as illustrated in FIG. 8. FIG. 8 depicts a Web browser 150 with a Web page that includes a playback control 152. The playback control 152 provides a graphical depiction of an audio or audiovisual file and typically represents the duration of the audio or audiovisual file. Additional playback controls 153 may be provided to control the playback of the file. Where the digital work is an audiovisual work, the visual portion of the digital work may be displayed in a section 154 of the Web page.

Annotations to the audio or audiovisual work may be indicated by indicators 156 and 158, for example, associated with the playback control 152. In the embodiment shown in FIG. 8, the annotations 156 and 158 are associated with particular content in the digital work. For instance, where the digital work is an audio recording of the installation manual shown in FIGS. 5-7, the annotations may be associated with particular steps in the installation as they occur in the audio recording. Activating the indicator 156, for example, may cause a window 159 to appear with a textual annotation associated with the particular installation step being described in the audio playback.

Alternatively, a digital work may be presented in textual form with annotations in an audio or audiovisual format. Activating an indicator in the display of the digital work may cause a playback control 152 and controls 153 to appear for operating the playback of the annotation to the digital work. If the annotation of a digital work is an image, activating the annotation indicator in the digital work may cause a window, such as window 154, to appear with the image annotation. As should be appreciated from the foregoing, the presentation and format of annotations of digital works is not limited.

FIG. 9 illustrates yet another embodiment of the present invention in which multiple annotations for the same content in a digital work are presented to the user in a form of a list. The Web browser 160 in FIG. 9 is shown displaying a Web page with a digital work 162 in textual form. Indicators 164 and 166 in the digital work 162 indicate the presence of one or more annotations. Should a user activate the indicator 164, for example, an annotations window 168 may appear providing a list of annotations to the user. The annotations in the list may be presented to the user in an order determined by reference to a criterion. For example, one criterion may be a ranking of the annotations assigned by others who previously have viewed and “voted” on the quality of the annotations. Those annotations having a higher ranking may be presented first. In circumstances where annotations are provided to users in exchange for monetary compensation, the users are more likely to select those annotations previously deemed to be of higher quality.

Another criterion for ordering a list of annotations is the price assigned to each of the annotations. A user may choose to have the lowest priced annotations or the highest priced annotations listed first. Yet another criterion for determining the order of annotations is the date of receipt of each of the annotations. For example, annotations that are more recent may be presented above annotations that are older. Other suitable criteria can be readily recognized by persons having ordinary skill in the art.

In some circumstances, user receipt of annotations may be conditioned on prior purchase of the digital work to which the annotations pertain. Conditioning the receipt of annotations on the purchase of the underlying digital work provides incentive to users to purchase the work. Moreover, authors of underlying digital works are more likely to grant permission to users to add annotations to the digital work, where such permissions are necessary. A user's purchase of the underlying digital work may be recorded by the transaction manager 72 in the transaction information database 26 and later referenced when the user requests the annotations to the digital work.

Also as noted earlier, authors submitting annotations may indicate particular content in the digital work to which the annotations pertain. Where the digital work is, for example, a book, annotations may pertain to the whole work or particular portions of the work, for example, a chapter, certain pages, or certain text on a page.

Further embodiments of the invention may allow users to receive authorization credentials to access annotations from one or more authorized distributors of credentials. For example, an entity providing only annotations to digital works may have a relationship with an online retailer that permits the online retailer to give authorization credentials to purchasers of digital works, which authorization credentials are valid for use in accessing annotations of the purchased works from the entity. In another circumstance, the author of an annotation may become an authorized distributor and distribute authorization credentials to others, allowing them to access the particular author's annotations. Distribution of access credentials in this manner may be advantageous where an author wishes to provide access to his or her annotations to selected family, friends, etc. For example, a group of students in a class or book club may each annotate a digital work and share their annotations with the others in their group by appropriate distribution of authorization credentials among the group. In yet another environment, a publisher may be an authorized distributor that distributes valid credentials for accessing annotations to works published by the publisher.

In still further embodiments of the invention, a computer-implemented method may be provided which includes obtaining a first representation of a digital work, the first representation comprising one or more images. A second representation of the digital work is obtained, the second representation comprising content of the digital work in a form that allows particular content of the digital work to be indicated. The particular content is correlatable with one or more locations in the one or more images at which the content is represented. The method further includes receiving an annotation of the digital work in regard to indicated particular content of the digital work, and providing to a user the annotation in context with regard to the digital work. In regard to the latter, one or more images of the digital work may be provided to the user such that the annotation is perceptibly associated by the user with the particular content in the digital work. For example, the annotation may be configured to appear to the user superposed on one or more of the images of the digital work. Alternatively, the annotation may be configured to appear adjacent to one or more of the images of the digital work. The one or more images may further include an indication of the particular content to which the annotation pertains. The indication of particular content to which the annotation pertains is typically received from the author of the annotation, though it may be received from others.

As previously noted, the annotation may be received from an author that is different than the source of the digital work. Likewise, the user to whom the annotation is provided may be different than the source of the digital work. It should be recognized that an annotation of a digital work may be further subject to annotation by another author.

In some embodiments, the annotation may be provided to the user via an online marketplace. If desired, the annotation may be provided to the user together with the digital work via the online marketplace.

While several exemplary embodiments of the invention have been illustrated and described above, it will be appreciated that various changes can be made therein without departing from the spirit and scope of the invention. The scope of the invention, therefore, should be determined from the following claims and equivalents thereto. 

1. A computer-implemented method for providing an annotation of a digital work, comprising: under control of instructions that are executed by one or more computing devices: receiving multiple annotations from different authors for particular content in a digital work; storing the annotations in association with the digital work; providing a list of abbreviated versions of the annotations to a user desiring to access one or more of the annotations; receiving an authorization credential from a user desiring to access one or more of the annotations; and if the authorization credential is valid, providing a full version of one or more of the annotations of the digital work to the user in context with regard to the digital work.
 2. The method of claim 1, wherein an annotation of the digital work is received in at least one of a graphical format, a handwriting format and a highlighting of text in the digital work.
 3. The method of claim 1, wherein the particular content in the digital work is identified by an indicator displayed near text in the digital work.
 4. The method of claim 1, wherein the digital work is an audio or audiovisual work and the particular content in the digital work is identified by an indicator displayed with a playback control provided for playback of the digital work.
 5. The method of claim 1, wherein the user has obtained the authorization credential in exchange for compensation paid by the user, the method further comprising distributing compensation to the author of an annotation.
 6. The method of claim 1, wherein the authorization credential is specific to an annotation desired by the user.
 7. The method of claim 1, wherein an annotation, when combined with the digital work to which it pertains, becomes accessible upon accessing the digital work.
 8. The method of claim 1, wherein the user has obtained the authorization credential in exchange for purchase of the digital work to which an annotation pertains.
 9. A non-transitory computer-readable medium having stored thereon computer-executable instructions that, in response to execution by a computing system, cause the computing system to: receive from a client system an annotation of a digital work by a first user; store the annotation in a memory in association with the digital work; require a second user desiring to access the annotation of the first user to perform a specified action before providing an authorization credential to the second user, wherein the specified action is electronically previewing a digital work; and upon receipt of the authorization credential from the second user desiring to access the annotation, provide the annotation to a client system for output to the second user, wherein the annotation is provided in context with regard to the digital work.
 10. The computer-readable medium of claim 9, further having stored thereon computer-executable instructions that cause the computing system to store the annotation in association with particular content in the digital work.
 11. The computer-readable medium of claim 9, further having stored thereon computer-executable instructions that cause the computing system to provide the annotation to the client system only after the user has purchased the digital work to which the annotation pertains.
 12. The computer-readable medium of claim 9, wherein the specified action further includes contributing an annotation of a digital work.
 13. A computing system programmed to provide a marketplace for annotations of digital works, comprising: a computing component configured to receive digital works from a plurality of sources; a computing component configured to receive annotations of digital works from a plurality of authors; a computing component configured to receive requests for annotations from a plurality of users and deliver annotations to requesting users; and a computing component configured to facilitate receiving compensation from users for delivery of annotations and distributing compensation to authors of the delivered annotations, wherein the compensation received from a user is represented by a valid authorization credential received from the user.
 14. The computing system of claim 13, wherein the compensation distributed to an author is a portion of the compensation received from a user.
 15. The computing system of claim 13, wherein the compensation received from a user is performance by the user of a specified action.
 16. The computing system of claim 13, wherein the compensation received from a user is included in compensation paid by the user to access a digital work.
 17. A non-transitory computer-readable medium having stored thereon computer-executable instructions that, in response to execution by a computing system, cause the computing system to: receive multiple annotations from different authors for particular content in a digital work; store the annotations in association with the digital work; provide a list of abbreviated versions of the annotations to a user desiring to access one or more of the annotations; receive an authorization credential from the user desiring to access one or more of the annotations; and if the authorization credential is valid, provide a full version of the one or more annotations of the digital work to the user in context with regard to the digital work.
 18. The computer-readable medium of claim 17, wherein the authorization credential is specific to an annotation desired by the user.
 19. The computer-readable medium of claim 17, wherein the user has obtained the authorization credential in exchange for electronically previewing a digital work.
 20. The computer-readable medium of claim 17, wherein the user has obtained the authorization credential in exchange for contributing an annotation of a digital work. 